Crochet Gauge Calculator

Tell it your swatch gauge and the size you want, and it does the stitch math so your project comes out the right size.

📖 How it works & FAQ

Gauge stitches (per 4"/10cm)

Gauge rows (per 4"/10cm)

Units

Target width

Target height

— Starting stitches chain —

— Rows to crochet for your height

— Stitch density per unit

Why gauge is the whole ballgame

Gauge is how many stitches and rows you get across a measured square of fabric. Two crocheters can follow the same pattern with the same yarn and end up with wildly different sizes, because hook tension, yarn weight, and stitch choice all change how tightly the fabric packs. This calculator takes the gauge from your own swatch and scales it up to the finished width and height you actually want, so a blanket meant to be 40 inches wide comes out 40 inches wide.

How the math works

Your gauge is measured over a 4-inch (or 10cm) swatch. The tool divides your stitch count by that reference length to get stitches per inch or centimeter, then multiplies by your target width to get the starting stitch count. Rows work the same way from your row gauge and target height. The starting chain adds one extra chain for the turning chain, which most single and double crochet patterns need.

How to use it

Crochet a swatch at least 5 inches (13cm) square in your project stitch, then block it.
Count the stitches across a flat 4-inch (10cm) section and enter it as gauge stitches.
Count the rows in the same window and enter it as gauge rows.
Pick your units, then type the finished width and height you want.
Read the starting stitches, chain count, and total rows — they update as you type.

FAQ

Do I need to block my swatch first?: Yes. Blocking relaxes the fabric to its true finished size, and skipping it is the most common reason projects end up too small.
Why add one to the chain?: Most stitches need a turning chain to reach the height of the first stitch, so the tool chains your stitch count plus one. Adjust if your pattern counts differently.
What if my stitch count isn't a whole number?: It rounds to the nearest whole stitch. For stitch patterns that repeat in groups, round to the nearest multiple your pattern needs.
Are these numbers exact?: They are close estimates based on your swatch, not a guarantee. Real tension drifts as you work, so measure again after a few inches.